It had been feared that McCarthy might be ruled out for several weeks but a calf injury was not as serious as initially feared.
Ta'auso is out with a fracture in his hand and will undergo further tests this week to establish the extent of it, while Morris has a back injury which forced him to retire in the opening game against the Ospreys.
Connacht (squad): A Browne, F Carr, S Cronin, G Duffy, A Flavin, J Hagan, I Keatley, R Loughney, K Matthews, M McCarthy, M McComish, J Muldoon, F Murphy, T Nathan, M Nikora, J O'Connor, R Ofisa, C O'Loughlin, B Tuohy, B Upton, B Wilkinson, A Wynne.
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